/*背景图*/

.a_background {
    width: 100%;
    height: 100%;
    position: absolute;
}

.a_background_top{
    width: 100%;
    height: 71.6%;
    background-image: url("../images/background/a_background_top.png");
    background-size: 100% 100%;
}


.a_background_middle{
    width: 100%;
    height: 13.1%;
    background-image: url("../images/background/a_background_middle.png");
    background-size: 100% 100%;
}

.a_background_botton{
    width: 100%;
    height: 15.3%;
    background-image: url("../images/background/a_background_botton.png");
    background-size: 100% 100%;
}